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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b33a7233945fc3dba97478d8980528f6132ed19367fd2d64a8c83a04040b9a42' 
  AND token = 'c1oPJJG3erUIy9d5FD/ygW2o/qjbakD+dHdK5m7+GOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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