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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '900c0cf93fb899955ff05763dc32cd78a90ed5879e36ebf17c937e03d3f26671' 
  AND token = 'LeAEIQ+sLTZyxGhb0Iu7eDS5QInauo6K++/h/LryD2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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