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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0a2693d9d1d78e993b756bf5889142fa94cb693cba55ac2f82faa4e0e26b39e' 
  AND token = 'Ycesd+pSerrczvKdTpoDfvfedrCTwcAuKiqMwYI7VBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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