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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4642e0d180d6791ab6036d96d7138c093a46f9a9e4dcd2a86ca4929562736aa' 
  AND token = 'xW+j5tzsZXhdEg2RSlUDAWmQas+E9dwEZQ4Jez132lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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