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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb770eae707c2deca6d46bf65cf6d55179f43c79b9ac318161c002e7081f90a' 
  AND token = 'jOXg1hDm9K2xI3Nl/pWzjPScE26p35Pza71mlPqdUYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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