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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b7e333f4c5ad365ced9db7b1671599baa8727399e709e7c17b71579880c5cf0' 
  AND token = '8NPRPPbcRXpUh9JxHQfEEiSqnzXKh1KHK/gvhi9tw1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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