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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51639accdf2ac594a3e35d52312c472e79cec64bc6faa2e45c9b87ae507fef19' 
  AND token = 'Wn05Q1T9IUvQ5I/UuOp8LYMQWkpVVY/APIyA+RJLsbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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