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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8533e9aaf89e30a8c6522075e6ab72a816a23fafd361e89eede596a36cea72b' 
  AND token = 'Q7tFsqhw6qou5QaAa9uC/HPq56IIamorFqqHILtQ/xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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