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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa9894906d2d13f395d35d464add0c3b70079edbc8500beaf11330185be2059' 
  AND token = '0erH9HnZTsDO65v9lMopDfywMjhUdOrcNeo1a/7RvvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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