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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db54cc9796838405c23afcce8de9e9b5249bd848f1e878f581c2eba5d09f4e36' 
  AND token = 'v20S/O0k0BeLevuBu9F9F1cMidU/YirdjTedSmQo7eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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