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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb5060eb6f8e14944047b8bef71dc03aec9d56d513941da8d5c0d032ff5905e' 
  AND token = '2iqxez8zWWWyEiHZ3fD68vTx2UOuqqrMQxrbH3XYa5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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