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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77208f764569a7ba38469a1ca57dabd2e5ea2543eec68362b6e1c417cffe825e' 
  AND token = 'usecVhoBa+CbQCUgWLkuzl5nCkDeZL8xh01WlsSeorM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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