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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33332b8ea5489ed01e235b47f8068f418a3d4a2151fbf0d33859897199c21880' 
  AND token = 'sPiQajaLuU6ioJX0l7P3XeSNsdDjZ/Q2CFlFtdpzkD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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