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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b3a28dc238e3e3d2dc83f194346ebfb16bc994c18060ab82d2ea46ed28ea8b5' 
  AND token = 'kZIC1LBu2wOutpNHZcmGOT+bkq0tPjLRQ6VqOLdpo4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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