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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d01903c1e72477d58cf24d7bd34ac34f9f075a106de9faabd11a5d1850ab95b' 
  AND token = 'XIeYRVnWvoJ4zGb38MU3WIOAnYimH/2eNZv7QiLj60g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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