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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd50972ff07790b06aca4de993e409048337427c79a9765a94236207af33a2f8' 
  AND token = 'b4eZIGj1D7yuAt47l0qjSSG7uE/CPZ8IZ1Bc+WZg2fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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