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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91bfde11d7c708d42738262fce2de2f363aa49a51df9be18e7a06b63f53c91d' 
  AND token = 'forLVtKDFEN9JNIPM96RQk0Qc5iSXtxlhW0S4Ow2Qlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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