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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e767164cfb8b46a84f39d8891f1982f92c194090262f5c147ad966ff3cedd1' 
  AND token = 'rwKDmpNirDaieS2bpONHvjIQnRMVCVn1IN5PkruUK8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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