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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a01b2fbff62e4455ee4fd24afa1ab1153c9001a544e0712e51bc6c6448a86d' 
  AND token = 'Js+J7PcflBrp1Xw3yug/HdmdafWLokO/gzSHT9tcm7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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