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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba092d6dffad266f129cbdeb5729932c2ae4abfa41e60fb4e6a7b3c42a261b49' 
  AND token = '/y2PyUTnrvA3KPZK2ZMWJIvPBQa6HFAqo1tTcjIgZsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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