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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b34988d301896cb4c6828d29caf0ba5fdabe1d10ce5e67b7fc5d45f63c284a9' 
  AND token = 'W7c0spy9P9OjUgqKsDY9dWQVQhbuYAaImHwp1ufuVF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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