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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abff7f97a001ff691be02a3364a7ec5d4d9e670b974864f44c78f53b3fd3ffe3' 
  AND token = 'g8bNZ/T+W6SeEp/w9bo36w67nkddqASH/9CKFSaGYlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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