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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71987f9c17a29b21da05d6a8bb2b27f9f542c4dfcdeb9364df213c4cbcd15a92' 
  AND token = '04xaRHIbUnPh2p/tPLClTPmHvi2IU4VjVWrSrioBdgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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