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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a1dc268790d9955f84460a15af419478212d60073e40274323e39321fc9bbc1' 
  AND token = 'TXoWlQ/h7RDnkbfoshaM51V4JWnzW0i4RuEF82RcTts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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