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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038cdc63a1380c0287d21db450e1455c39efe417416de15cb4e688106a5623a2' 
  AND token = 'gRN52GDrA3VG+MB64i7QsDKptJYhBs7d2CyiNp75UW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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