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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64f7165e2c0d22b4246d3b9e5a1f72aa9ea2b3ed18044c5c37389e8d746aacd8' 
  AND token = 'fbSIHVS+L/5lF1oMvWHqqXRdDopc7QHO2hhCGT+ql7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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