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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'debc54aad3dbdd50a0033d51c78d8b1da1e764aee343889633ec0d4981ab4e30' 
  AND token = 'bCHOMmBDIFC46RWwUkBhm8PL3uu+YQvIWtXQrPHwxhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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