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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbfc373ce0aff6fc0d84cfb5590a029d450f9d10b23c0837fddaf2fabae38606' 
  AND token = 'veRfkVYrkEy8womWI2EBpzbVNZ1HmdUdZ8jeiC7Hevw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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