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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b226deb6b90abc1dd76a0a062f1e4925b20479bff581bfb15a6ecf46619851e' 
  AND token = 'T4HFLduygd5Ns/UHdNbN/C0r43N/a/fjUvhD0jupMyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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