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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fc8a942e528e4ac83472af43f911f67143ff4d8829d14fa048e24b11d18bf4e' 
  AND token = 'mF+qAJeuGF9Zdl5zzcHsuPeDV5Kd/1mHnbYcYKBn0pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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