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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8abafca597235e4f7ac2a59ff9da77b73a4970181466ea5ac657370b3c88c10a' 
  AND token = '6mv1rXQVTRgmU2OkkX2avJk6MF/yb0L/61lTa503x3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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