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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d431a3743c7485a86b473a73a93511336fbe5ad75a79896148e3bbac4fa333' 
  AND token = 'sg1fBp37kvB+/fxelOfP8fz50p1KBGzNERXg+1aseLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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