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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '963e5b7977b1c4d30cf82df24a58e5268c2fc797a10ca6e0a4aa3ce71ff3e001' 
  AND token = 'VsrlNOuh2b0jP17kuKYHAuqpmNzePMixXoEQMmUjZ00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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