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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad6115bc317eb44cb2d30d44916d08ab48b0bca45caa675b5d7bb862b0532de8' 
  AND token = 'U94Jn/GBC5Z+hUW01zUPRJAD7rJVszSdy32BOfw4Eow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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