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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8de0ef10da66baf185f2b695af3826299d2c4bb2c8acea9e9cab4279cd6c3312' 
  AND token = 'Yg26JLdPu3/MvsnDP0sBDKWJdUZY93DO4ocvSLdAm20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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