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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92266175a92d2748d073ee6a77e17b84594d9f29dc8749fb4c380814bb59d77c' 
  AND token = 'RBncqQZ7F5thYYXdr/nVQ71ATucZVtCFxEofhDqyFmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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