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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dbeb273bc688c3de4f392b2cd224d244122fb519a7ac75f6c7ad99965c9eb6a' 
  AND token = 'aiTHeNoEqdA43v4ZdZsh1gRys5Wf522n7tM7QfiBfvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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