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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '037081b61bac86341be81a0d85ba106271640b6bf8adfb7d60f2293c5480e370' 
  AND token = 'DYAs/iQYT7PHjsUpeJUYur+ENdo98fV9fQDB9FzkO1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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