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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '478d814b0cf9081dd084227fc3c5c745c57c698dadf7c167919d8874cb3fd904' 
  AND token = 'K76ErlVMmX3U2Fg3O1MSWrHav09rHIbtF0Y3D+hDk/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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