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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83b5fc8969fe03f930558984c7cac1e2f50bc92c132d2980256a8eb628c9557' 
  AND token = 'kSWrUATs89lvb/raW0dFxFkcD0CkBK2V2W2/AtTRFJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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