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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86fd0ec5f947ed128a0f36aed8d893a1f9bcc923607017118b6aa9f9421dab1d' 
  AND token = '94+/D90HOlcTsuwOl1EPjMFe26wTkBvnCBnPhMbIjhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00094

JSON explain

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