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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f867ad90525f1f57d14dfd523b076b746f8dd6b6686c52228f3537eeb5c585f' 
  AND token = 'e57X/NrO/deStyS6xzgrlCbennPd0J63VPS3KtfsEDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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