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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '256f58fc3c9dfac13844af3cafab4f0f40028e5feaeb1821b8cc7ae30fd13e48' 
  AND token = 'gyN0tT6aFaY8thgFkrkCrWMJA+KMufgjmON+dlXe/4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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