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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae0538539c2ffc4ace48a824d5f159d3fa79e6fbf4042c4a8cf69a25ea2d83e' 
  AND token = '4GAkyXevMlhnD7EY464393gFNyl6tITBPalEK6iH4To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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