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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b042efdc09b24c4200bbeda5ce233ac9f21089501f3b453da4c4434cf94ef9e1' 
  AND token = 'u441zzHaYvYUbP1fgkQRiGL/1vhOVwSmNrFQ1Ri5uow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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