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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99a969ba2fc4e06a9de5f829652fac9853db6e6ea458e170a306cb04c47ab2cf' 
  AND token = 'Z7mYJgtdovdQxLQfPINX8VWa8Zq7SqcIKZt4Jo3XHi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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