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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9107d2497184f109030cd9c13dd0a00655acae4885b6dc6776fad7fc9bd910f' 
  AND token = 'wSYf2cZIl1ZD1w7NT/bG1W8H1kK9aGpgsaVQiNGa1wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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