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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6363c50694fab2177ba91448091d02c3493384fbbba5a4d7de31ad2ed7a1f3d' 
  AND token = 'sChx1JgEIflwID6/TwzJBJVuXlYAaoS7E0rP5er/H/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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