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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54f7e711dd83c330f2c0ee6a1f6d3dab38463127681bf14c76841ba037d67af0' 
  AND token = '5ytRnZkHfaQeP/V0N3mozEn/qT0aMRhoIz6uQAukIKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}