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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76393d40fd2c56cae407c151aa10fde7682469ea062747ac33c3394ab760e93b' 
  AND token = 'sjTSomEVrm7xUDHevXu0Qs0uoSPhotr+SD39Pruwli0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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