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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d5cda751e2c86305049f3c02ad3b2be22626242cf3fca1c949d5d8cce8683d7' 
  AND token = 'CpXvaARhcY4etaaoFpeb8wbE3bpaKKs4slrddMwLyt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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