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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f1e4a9ecaa170b838e6e437794da10bce768b200dd682d7b22421b2a5e3fc99' 
  AND token = 'Q6bHmC6VHtFbCVQT1cDjG6h8rWFu+3ukVyJ1ojdfze0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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