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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58411a81623db415680c95d46623cc6498ab3f694dee38763dedaa522be180d6' 
  AND token = 'SqrxH06dHW/5jPM/mzi/S2NL4q+n1v5w62c346WW5jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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