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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67f8b3b91af124176e90578fed6c4627a90d9ad5b6b40883144e46cc4bd53a54' 
  AND token = 'dnFddd9dLlg5GaZl1feArvfvsGli/k+DvU5lroHHaUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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