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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c6550dd8bf09fe3a139f5aa95763e0def928714f0efe4836d23748b88af2168' 
  AND token = 'ZOQiaWCg/xzY93c7WP64oQ4J7y/xOvs2WpRWkQBplE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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