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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e2e38a2892d43b45e9729dd83d0d92643ee9f0b533683f9f1a4b9580a29f64' 
  AND token = 'bwtGK8tu1/MMGC2lrDEesWBXDGA/abA0y2zuvJXBtYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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