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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de48166236e4b545a7e26d6150a5fba30c4c36fdd919f17f74f59f0b9ecc0a9a' 
  AND token = 'x8sO7U7s6jmzmMjXRjOro98Ux5/yqjW9D3AyX4fDQOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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