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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52989e1464904324927c54126c85716991de3e7c9713430f912674355ee02fd6' 
  AND token = 'Plz0szBdk0iOko6POWqWJSt/51vgsXgXdzlMvotq/So=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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