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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f62f2a70ee95fe18df50628ad6c65282730c85be59b0fe9618382f5aeb6a69' 
  AND token = 'xhCCjxzMr17/SxpV87KTMN+lFWPiE+z3kFy4dpcELFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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