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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b78d189a7eace52175f9505919cbac913c9dee389210e9557365d06c0f2730b4' 
  AND token = 'UZ5l27+9ar218RDziAGNLvIbLIuVqDFb6qI1LeSbOjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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